<template>
  <view>
    <view class="search-box">
      <!-- 使用 uni-ui 提供的搜索组件 -->
      <uni-search-bar @input="input" :radius="100" cancelButton="none" placeholder="请输入商品内容" ></uni-search-bar>
    </view>
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item)" >
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="clear"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag :text="item" v-for="(item, i) in histories" :key="i" inverted circle type="primary" @click="gotoHistory(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        //延时器的 id
        timer:null,
        kw:'',
        // 搜索结果列表
        searchResults:[],
        historyList:[]
        
      };
    },
    methods: {
      input (e) {
        // 防抖处理，开启一个延时器
        clearTimeout(this.timer)
        this.timer = setTimeout(() => {
          this.kw = e
          // 根据关键词搜索列表
          this.getSearchList()
        },500)
      },
      // 根据搜索关键词，搜索商品建议列表
      async getSearchList() {
        //判断关键词是否为空
        if (this.kw === '') {
          this.searchResults = []
          return
        }
          // 发起请求，获取数据列表
          const {data:res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query: this.kw})
          if (res.meta.status !== 200 ) return uni.$showMsg()
          this.searchResults = res.message
          
          this.saveSearchHistory()
        
      },
      gotoDetail (item) {
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
        })
      },
      saveSearchHistory () {
        // this.historyList.push(this.kw)
        const set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList = Array.from(set)
        // 调用 uni.setStorageSync(key, value) 将搜索历史记录持久化存储到本地
        uni.setStorageSync('kw', JSON.stringify(this.historyList))
      },
      // 清空搜索历史记录
      clear() {
        this.historyList = []
        uni.setStorageSync('kw','[]')
      },
      // 点击搜索历史，跳转打搜索历史页面
      gotoHistory(kw){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query=' + kw
        })
      }
    },
    // 计算属性
    computed: {
      histories () {
        // reverse()数组反转
        return [...this.historyList].reverse()
      }
    },
    onLoad() {
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    }
  }
</script>

<style lang="scss">
.search-box {
  background-color: #c00000;
  position: sticky;
  top: 0;
  z-index: 999;
}
.sugg-list {
  padding: 0 5px;
    .sugg-item {
      font-size: 12px;
      padding: 13px 0;
      border-bottom: 1px solid #efefef;
      display: flex;
      align-items: center;
      justify-content: space-between;
      .goods-name {
        // 文字不允许换行（单行文本）
        white-space: nowrap;
        // 溢出部分隐藏
        overflow: hidden;
        // 文本溢出后，使用 ... 代替
        text-overflow: ellipsis;
        margin-right: 3px;
        }   
    }
}
.history-box {
  padding: 0 5px;
  .history-title{
    display: flex;
    justify-content: space-between;
    height: 40px;
    align-items: center;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }
  .history-list{
    .uni-tag {
      margin-top: 5px;
      margin-right: 5px;
    }
  }
}
</style>
